When it comes to features we are talking plentiful but mid-range, rather than high-end. The 3G compatibility is accompanied by a front-facing camera for video calling and off 3's portal, Web browsing was not too bad an experience given the small screen on this phone. Pages I tested were rendered to fit into the available screen space so that no horizontal scrolling was required. Text was pretty small, but you can push the screen into landscape format to make the most of it. In many cases the ‘text only' view was preferable not only for download speed but also for readability.
Counting up the features on this phone shows how far we have come in terms of defining mid-range handsets. There is oodles going on here.
I'll come to the camera shortly, but first up there's an FM radio with RDS, which is hardly standard fare. Then there's the VideoDJ and PhotoDJ media editors as well as music composer called MusicDJ. Sony Ericsson's TrackID purports to be able to identify songs from just a short recording, too. These are pretty standard fare for Sony Ericsson handsets as is the Bluetooth stereo output and the ability to blog photos from the phone.
The Bluetooth is a real boon especially because Sony Ericsson is still wedded to its proprietary headset connector. It is a pity that you need to have the provided headset connected to use the FM radio though. Maybe one day Sony Ericsson will find a way of embedding the FM antenna into the phone.
Other stuff includes an RSS reader, PIM tools (calendar, to do list, note maker), voice recorder, alarm clock, stopwatch, and timer. There is just 16MB of memory on the phone itself, but Memory Stick Micro is supported and in our case a rather measly 256MB card was supplied with the phone. The card sits in a slot that is under the battery cover but not under the battery, so swapping cards is fairly painless.
Of course the K770i plays music. This is not a Walkman branded handset and its features aren't as sophisticated as those mobiles that do have this branding. But still, it is likely to be used for mobile tunes. My battery life test; getting the phone to play music non stop, got me a respectable 12 and a quarter hours of music, which would certainly be enough to see me through a day's music needs.